Method and apparatus for controlling uplink transmissions of a wireless communication system
First Claim
1. A method for controlling transmissions on an uplink in a communication system, comprising:
- determining one or more characteristics of the communication system;
partitioning available system resources into a plurality of channels;
defining a plurality of back-off factors for the plurality of channels based at least in part on the one or more determined characteristics of the communication system, wherein each channel is associated with a respective back-off factor that identifies a reduction from peak transmit power level, and wherein each back-off factor ranges from zero to one; and
assigning the plurality of channels to terminals for data transmission at power levels determined based at least in part on the plurality of back-off factors.
2 Assignments
0 Petitions
Accused Products
Abstract
Techniques to partition and allocate the available system resources among cells in a communication system, and to allocate the resources in each cell to terminals for data transmission on the uplink. In one aspect, adaptive reuse schemes are provided wherein the available system resources may be dynamically and/or adaptively partitioned and allocated to the cells based on a number of factors such as the observed interference levels, loading conditions, system requirements, and so on. A reuse plan is initially defined and may be redefined to reflect changes in the system. In another aspect, the system resources may be partitioned such that each cell is allocated a set of channels having different performance levels. In yet another aspect, terminals in each cell are scheduled for data transmission (e.g., based on their priority or load requirements) and assigned channels based on their tolerance to interference and the channels'"'"' performance.
238 Citations
37 Claims
-
1. A method for controlling transmissions on an uplink in a communication system, comprising:
-
determining one or more characteristics of the communication system;
partitioning available system resources into a plurality of channels;
defining a plurality of back-off factors for the plurality of channels based at least in part on the one or more determined characteristics of the communication system, wherein each channel is associated with a respective back-off factor that identifies a reduction from peak transmit power level, and wherein each back-off factor ranges from zero to one; and
assigning the plurality of channels to terminals for data transmission at power levels determined based at least in part on the plurality of back-off factors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 24, 25, 27, 28, 30, 31, 32)
-
-
16. A method for controlling transmissions on an uplink in a communication system, comprising:
-
defining a reuse pattern for the communication system, wherein the reuse pattern includes a plurality of cells;
determining one or more characteristics for each cell in the communication system;
partitioning available system resources into a plurality of channels;
defining a plurality of back-off factors for the plurality of channels for each cell in the communication system based at least in part on the determined one or more characteristics, wherein each channel of each cell is associated with a respective back-off factor that identifies a reduction from peak transmit power level, and wherein each back-off factor ranges from zero to one; and
assigning the plurality of channels in each cell to terminals within the cell for data transmission at power levels determined based at least in part on the back-off factors associated with the assigned channels.
-
-
23. A method for operating an uplink of a wireless communication system, comprising:
-
partitioning available system resources into a plurality of channels;
defining a reuse pattern for the communication system, wherein the reuse pattern includes a plurality of cells;
determining one or more characteristics for each cell in the communication system;
allocating a set of channels to each cell based at least in part on the determined one or more characteristics for the cell, wherein each allocated channel may be assigned to a terminal for data transmission on the uplink; and
repeating the determining and allocating to reflect changes in the communication system.
-
-
26. A method for operating an uplink in a communication system, comprising:
-
defining a reuse scheme to be used for data transmission by a plurality of terminals, wherein the defined reuse scheme identifies a particular reuse pattern, an initial allocation of available system resources, and a set of operating parameters;
scheduling terminals for data transmission in accordance with the defined reuse scheme;
receiving transmission from scheduled terminals;
evaluating performance of the communication system;
determining whether the evaluated system performance is within particular thresholds; and
if the evaluated system performance is not within the particular thresholds, redefining the reuse scheme.
-
-
29. A method for scheduling a plurality of terminals for data transmission on an uplink in a communication system, comprising:
-
receiving a first set of parameters to be used for scheduling terminals for data transmissions;
prioritizing terminals to be considered for scheduling;
scheduling one or more terminals for data transmission based at least in part on the priority of the terminals;
assigning a channel to each scheduled terminal;
updating a second set of parameters used for controlling transmissions by the scheduled terminals; and
receiving one or more transmissions from the one or more scheduled terminals on the assigned channels.
-
-
33. A method for scheduling a plurality of terminal for data transmission on an uplink in a communication system, comprising:
-
prioritizing terminals to be considered for scheduling;
computing a channel metric for each of a plurality of channels for each terminal;
assigning the terminals to the channels based on priorities of the terminals and the computed channel metric, wherein the assigning includes selecting a terminal having a highest priority, assigning the selected terminal to a channel having a least favorable channel metric but meeting requirements of the terminal, and successively assigning remaining terminals, in order of decreasing priority, to remaining unassigned channels; and
receiving transmissions from the scheduled terminals on the assigned channels. - View Dependent Claims (34, 35, 37)
-
-
36. A base station in a communication system, comprising:
-
a resource allocation processor configured to receive data defining a reuse plan to be used for uplink data transmissions by a plurality of terminals, wherein the defined reuse plan identifies a particular reuse pattern, an allocation of available system resources to a cell covered by the base station, and a set of operating parameters, wherein the resource allocation processor is further configured to schedule one or more terminals for data transmission and to assign a channel to each scheduled terminal;
at least one front-end processor configured to process one or more received signals from the one or more scheduled terminals to provide one or more received symbol streams; and
at least one receive processor configured to process the one or more received symbol streams to provide one or more decoded data streams and to estimate one or more characteristics for the cell, wherein the resource allocation processor is further configured to receive channel state information (CSI) indicative of the one or more characteristics and to schedule terminals and assign channels based on the CSI.
-
Specification